| Conflicted Conservation: When Restoration Efforts Are Pitted against Human Rights Even as industrial civilization reaches into the farthest corners of the globe to extract resources such as oil, timber and fish, environmentalists are striving to mitigate its deleterious effects on the biosphere. Projects to reduce pollution, prevent climate change and protect biodiversity, however, are drawing criticism that they could drive indigenous people off their lands and destroy their livelihoods.Conservationists have historically been at odds with the people who inhabit wildernesses. During the last half of the 20th century, millions of indigenous people in Africa, South America and Asia were ousted from their homelands to establish nature sanctuaries free of humans. Most succumbed to malnutrition, disease and exploitation, recounts anthropologist Michael Cernea of George Washington University. Such outcomes--coupled with the realization that indigenous groups usually help to stabilize ecosystems by, for instance, keeping fire or invasive weeds at bay--have convinced major conservation groups to take local human concerns into account. The World Wildlife Fund (WWF) now describes indigenous peoples as “natural allies,” and the Nature Conservancy pledges to seek their “free, informed and prior” consent to projects impacting their territories. [More] rss.sciam.com |
Don't Let the Bedbugs Bite: Pest Management Proves More Effective than Pesticides In a large apartment building, it’s impossible to avoid the neighbors. You can hear the Bruce Springsteen that the tenant in 7B cranks while vacuuming, the kids in 8A directly above tromping around, and if someone decides to paint, the fumes reach everyone on the floor. So when a building supervisor notified owners in a sixty-unit co-op building in Brooklyn that one of the apartments had a bedbug infestation, Eddie Rosenthal feared that it was only a matter of time until the bugs spread to his home. [More] rss.sciam.com |
Green for Green: U.S. Stimulus Package Offers Businesses $7 Billion in Environmental Incentives Dear EarthTalk: I've been following reports about President Obama's stimulus package and what it may mean for creating green jobs. Beyond that, are there programs in place to help businesses switch to greener raw materials and/or to green up operations overall? --Diane, via e-mail [More] rss.sciam.com |
More Food from Fungi? To feed an exploding global population, scientists have called for a doubling of food production over the next 40 years. Genetic manipulation might seem the best way to quickly boost characteristics essential to plant growth and crop yields. New findings from different laboratories, however, suggest that fungi, bacteria and viruses could be an exciting alternative to increase agricultural productivity.Scientists have long known that microbes can work symbiotically with plants. For instance, mycorrhizal fungi, which are associated with 90 percent of land plants, extend from roots to bring in moisture and minerals in exchange for plant carbohydrates. But microbes have recently been found among plant cells themselves and seem to confer benefits, such as more efficient photosynthesis and increased ability to fix nitrogen from the air. In fact, Mary E. Lucero, a biologist at the U.S. Department of Agriculture’s Jornada Experimental Range in Las Cruces, N.M., believes that plants actively recruit these microbes rather than simply being passive hosts for them. [More] rss.sciam.com |
Quantum Light Switch: Single Atom Acts as a Transistor for Photons Point two laser beams so that they cross each other, and each goes through as if the other one did not exist. Light rays cannot interact with other light rays--or can they? With the help of a single atom, physicists have devised a system in which one light beam can turn another on or off. Such a light switch could serve as the basic component of futuristic optical quantum computers and may help open the way to a quantum version of the Internet, which would offer unbreakable data security.The device makes use of a phenomenon called electromagnetically induced transparency, in which a laser beam can render opaque clouds of atoms temporarily transparent to a narrow wavelength of light. The cloud can then act as a switch for a second beam, either letting it through or blocking it. The result is similar to what happens with transistors in electronic circuits, where a voltage applied at one electrode controls whether current can flow between two other electrodes. [More] Laser - Light - Physics - Quantum mechanics - Quantum computer rss.sciam.com |